Machine for machining arcuate surfaces



3 Sheets-Sheet 1 E. BARKER lMACHINE FOR MACHINING ARCUATE SURFACES Dec. 14, 1948.

Dec. 14, 1948. E. BARKER MACHINE FOR MACHINING ARCUATE SURFACES Original Filed Nov. 5, 1942 3 Sheets-Sheet 2 UTIUCTIVOY Dec. 14, 1948. E BARKER MACHINE FOR MACHINING ARCUATE SURFACES 3 Shee'ts-Sheet 3 Original Filed Nov. 5, 1942 Patented Dec. 14, `1948 2,456,041 MACHINE rolt4 MAcHnsiNGARcUAr-LE SURFACS Edgar Barker, T610nto,.0ntaif0;-Canada- Original' application N'ovemler 5', 1942;.. Serial N'of 464,615; 110W Patent N0. 2,379,670; ldated July 10, 1945". Divided and this; application January" 153, 194,5; Serial N". 572,665`

( Cl. Y 90f161)i Claims.- la

This. application' isf' a". division of. application: Noi. 4641615, filled: November`4 5;y 1942, Patient No: 2;3'fl9,87f01,. issuedy July' 10,'. 1945;

Thiseinvention.. relates -tol machines forma-chin'- ingl arcuate surfacesy and'. more particularly' to" millingIk machines and my? object is'. to= devise' aA simple? machine: for` cutting any' desired radius:y within @predetermined range', without using any' special forms; for' conveying the4 work: to' the cutters.. A: further' Objectis' topro'vide apparatusffo'r" automatically controlling the machinei so" that'- thef operations; will bei effected'. in'.= au minimum.' of

time. l

' The" inventiorif is hereinafter-1 more.y fully de@ scribed.:` and is illustrated, byy way of.j examplesini` the accompanying: drawingsi ini which Figure; 1.1 is.y a'. front" View of ai milling' ma'clf'iin'e,V partly broken away, and partly in-sectionf em' bcdying my' invention;

Figureiz aplan View!ofthetabler'andbedof themachine, with the overarm' removed;`

Figure 3 aA diagrammaticalfV view' transversely oil the ma'chineshowing the' mechanism forv d-riv'-V ing; the'r table and'. the timing barj Figure: 4 a cross-section of the: uwerarr'n1 and cutter heads; on an enlarged scale.;

Figurel 5: af longitudinal; sectional detail. of.' the. drive for the horizontal cutters;

Figure: 6` a. perspective viewv of` one piece of? work;

Figure 7 zar-perspective view of another piece'k of? work;.

Figure` 8-a-detailin planfofa diierent-v piece: ofy Work' andv afmodied arrangement ofcutters;

Figure 9 a'` cross-sectional.l detail: ofi.` the? work in Figure 8;

Figure 10 a diagrammatic'vvew of a further` piece of work showing the cutters arranged oithef vertical and horizontal` positions shownl inf- Fig;- uizesl and 5; andV Figure-A11.. a diagrammatic View ofthefee'd-'conf trol. panel.

In the drawings like numerals ofreference fin-- dicate the corresponding parts in the' dier'exit figures.. l Y y l is .the iraniani-theA machine zwl'iich"includesfa:1 bedl 25, stanchions. 3 and` 4 ati. opposite ends:v oft the?y bed; andanfoverarmf:fsuitably supportedmy the: stancliions. A: horizontall table 6 is upivoted atl 'ly and. is suitably,v supported on=the bed 2 for oscil'F-- lation.,thereon; The periphery of they table has.' racl:v teeth.8 which mesh. withl a' pinion Seonl al@ vertioallshaft.. I (l. which i isA rotated by means: of ai piston rod I-l. connected with apiston' ina drauliecylinder.- l2. The, pistom rode l'lha's: tauleA teeth which mesh with a'. second pinion v |131 onithef shaft l0 so that by varying the rate of flo'w off uid to? theY cyflimier.v the. speed? of the: piston: r'od and thus of.y th'eftabl'efi will beyaried'.

'Ilherateioff speed o'ff the tabl'e in' either' direction of rota-tion'iis controlledby any'suitabl'feed control mechanism i4; which'. causes fluidtolc'eA alternately directeur' intoA opposite ends` of! the" cylinder I2-,the1 end opposite' thatl` being'suppliedi with: fluidi to-be drained,and-Lthe1 rate oi flow'o'f" the fluid discharged from' the cylinder to' be" varied:y I pr'o'videf a reciproca'blef tim'ingf bar" li'5' anditrlpfdbgs i6, adjustably carriedtl'iereby; for op'eratingtheabove control mechanism l'll.y The f timingfbar |5is reciprocated from the-tablea'c tuatingi means'l so^ that" the-bar operates in s'ynh Clirni'sm with the? table. Thus as the liable swingsi through arr arcl of any predetermined lerigls'h the: mechanism 15- is' operatedy from' theu l timin'gibar tu" causethe' next' change in"y the cycle- 13u-occur Thetiming bai" I5 is slidablyvv mounted' in brackets l1, for carrying the panel oi'thefeed controlmechani'sm I4, an'dis provided withrack teethiwliiclilriieshlwithfagear I8 on aispin'dle Ill'.i

The'latter is'c drivenA by bevelv gears -2ll` from ej crossV shaft-211 whiclii is l driven` by bevel.l gearing" 22 from3 the2 vertical: shaft'. Ill/L The@ Work 23`1may? be carried by' any" suitable" fixture: 24?, whichi may be se'cure'd by' anyJ suitable* dove-tailedic'onriectionwitli thetable'lor the `latter may have one or more T slots for receivirig"y headedbolts to secure: the'fxtu-re'l to the table. The: dove-tail on' the: table or the slotsfrnay ex tend:radiallyffrom'ithe'pivot'l' or' they mayI extendf' in. anon-radial: direction. In-` an'y case the work is: adjustable relative? to th'ei pivot 'if t'ov` cut any' desired. radius Within the usable' liniit'sl of. the working, area aci-.the ftables A graduateds c'a'lelmay besfp'rovided; for vuse by" the-1 oper-ator' in` setting; upthe Work.- A plurality of surfaces of' the' worli` arepreferably cutsimultaneouslyby milling cut# ably" parallel` t one another' and to tile-surface-`r cylinder and a drain pipe 44.

of the table 6 and are vertically spaced apart to cut the upper and lower sides of the work. These cutters are carried by a cutter head 30 which is slidable on the other side of the overarm 5. A manually operable screw 52 moves the cutter head 36 longitudinally of the overarm to adjust the cutters 26, 21 relative to the axis of the table. To permit the cutters 26, 21 to be adjusted relative to one another to take up wear and to suit work of different thicknesses, the lower cutter 21 is carried on a vertically adjustable slide 3l mounted on the cutter head 30. The cutters 26, 21 are driven by worin wheels 32, 33 which mesh with worms 34, 35 on a shaft 36 which is driven by bevel gears 31 from a sleeve 38 splined on a shaft 39. The sleeve slides along the shaft 39 as the cutter head 30 is moved along the overarm 5. When the slide 3| is moved relative to the cutter head 30, the worm wheel 33 rolls along its worm 35 whereby the cutter 21 may be driven in any desired position relative to the other cutter 26.

The splined shafts 29 and 39 are driven by any suitable means from an electric motor 4I).

The pair or set of cutters 26, 21 are at one side of the cutter head 30 and are carried -by spindles 53, 54 to which are secured the worm Wheels 32, 33. The spindles also extend through the other side of the cutter head for carrying another pair or set of cutters 26a, 21a. With this arrangement the cutters 26, 21 will be used simultaneously with the cutter 25 to mill a convex surface A and the upper and lower sides B and C of the work 23. The other set of cutters 26e, 21a will be used simultaneously with the cutter 25 to mill a concave surface D and the upper and lower sides E and F' of the work 23a. This arrangement of the two sets of horizontal cutters provides clearance for the cutter heads 4which may thus be positioned at the side of the work remote from the fixture used to secure the work to the table.

In practice, the table 6 is advanced rapidly from its loading position until the work reaches a point close to the cutters; the speed of the table is then reduced to the desired cutting speed until the Work has moved past the cutters; the cutters are then stopped and the table is brought to a stop for a predetermined short period of time to ensure the cutters have stopped; thereafter the table is returned rapidly to its loading position.

The hereinbefore mentioned automatic feed control mechanism I4 is Wellknown in the art and includes a plunger 4I which when manually operated by a lever 42 establishes communication between a supply pipe 43 and a pipe 48 leading to one end of the cylinder I2. At the same time the plunger establishes communication between a pipe 49 connected with the other end of the The latter leads to a tank 45 from which it is pumped to the supply pipe 43 by means of a suitably driven pump 50. f

Since the timing bar I is reciprocated in synchronism with the turning table 6 as hereinbefore described, the trip dog I6, when the work reaches the predetermined point near the cut-- ters, engages the plunger 4| and depresses it a predetermined distance whereby the rate of discharge from the cylinder is restricted so that the rate of feed is reduced. The restricted flow is manually adjustable so that the table will be rotated at the desired cutting speed. After the 'work has been moved past the cutters, a trip 4 dog I6a on the bar I5 engages and opens a limit switch 46 carried by the frame of the machine. A trip dog I6b also on the bar I5 simultaneously actuates the plunger 4I to stop the flow of uid to the ycylinder I2 and thus stop the further feed movement of the table 6. The opening of the limit switch simultaneously causes, first, the circuit leading to the motor 40 to be broken to stop the cutters 25, 26 and 21; and second, causes a well known pneumatic electric timing device to be energized, which device, after a predetermined dwell to ensure the cutters have come to a dead stop causes a solenoid 41 to be energized. The solenoid is connected with the plunger 4I and is adapted, when energized, to move the plunger to establish communication between the supply pipe 43 and the pipe 49 and between the drain pipe 44 and the pipe 48 which causes the travel of the piston to be reversed at a rapid speed whereby the table will be returned to its initial position at a high rate of speed while the cutters are stopped. The direction of travel of the timing bar I 5 is thus also reversed and as it nears its initial position, a

lift up dog I6 engages the plunger and raises it into its stop" position thus completing the cycle and stopping all further movements ofthe table until the lever 42 is again manually operated. The motor 40 is manually started by a start push button 55 and may be manually stopped by a stop button 56.

It will be understood that various modifications may be made lwithout departing from the spirit of my invention. For example, grinding Wheelsmay be substituted for the milling cutters or the machine may be a shaper instead of a milling machine in which case the cutters would not be rotated.

It is obvious that various arrangements of cutters may be used to machine various kinds of work. For instance, to machine the faces G, H, I, J and K of the work 23b in Figures 8 and 9, three vertical Cutters 25a, 25c and 25d are used. The two cutters for the outside faces G and K are carried by two heads 36a, 30b which are independently movable, by separate manually operable screws 52a, 52h, along one side of the overarm 5. The screw 52B has a threaded connection with the head 30a and passes freely through an opening in the head 30h. The other screw 52b has a threaded connection with the other head 36h and passes freely through an opening in the head 36a so that either or both heads may be moved along the overarm to suit work of different widths. The cutter 25a for machining the surfaces H, I and J is carried by the hereinbefore described head 28 which is movable along the other side of the overarm 5.

In Figure 10, the work 23c has its faces L and M machined by the cutters 25b and 261. The axis of the vertical cutter 25b is positioned at an angle to the vertical and the axis of the horizontal cutter 2Gb istat an angle to the horizontal.

What I claim as my invention is:

1. A machine of the class described having a frame including an overarm a movable table suitably mounted on the frame for carrying work; a

-cutter head movable longitudinally on the overshaft; and worm gearing between each of the cutters and the vertical shaft for driving the cutters and permitting relative movement thereof.

2. A machine of the class described having a frame including an overarm; a movable table suitably mounted on the frame for carrying work; a cutter head movable longitudinally on the over-- arm; a rotary cutter horizontally journalled on said head; a slide vertically adjustable on said head; a rotary cutter horizontally journalled on said slide below the first cutter for movement relative thereto; a suitably driven horizontal shaft; a sleeve splined on said shaft and journalled in said cutter head to move therewith; a bevel gear secured to the sleeve; a vertical shaft journalled i-n said head; a bevel gear secured to the vertical shaft and meshed with the rst bevel gear; and worm gearing between each of the cutters and the vertical shaft for driving the cutters and per mitting relative movement thereof.

3. A machine of the class described having an overarm; a movable table suitably mounted on the machine for carrying work; a vertical cutter for machining concave and convex surfaces on the work; tWo sets of horizontal cutters, the sets of cutters being spaced apart horizontally and the cutters of each set being adjustable vertically to vary the distance between the cutters of each set; a cutter headfor carrying the vertical cutter movable longitudinally on one side of the overarm; a second cutter head for carrying the two sets oi horizontal cutters movable longitudinally on the other side of the overarm, the said cutter heads being independently movable longitudinally of the machine relative to the table and past one another so that the vertical cutter may be used simultaneously with one set of horizontal cutters t9 machine a concave surface and u pper and lower sides of the work, and be used simultaneously with the other set oi horizontal cutters to machine a convex surface and upper and lower sides of work.

4. A machine of the class described having an overarm; a table mounted on the machine for carrying work, said table being oscillable beneath the overarm to carry the work in an arcuate path; a vertical cutter for machining concave and con- Vex surfaces on the work; a cutter head for carrying said cutter, said cutter head being slidably mounted on one side of the overarm; a set of horizontal cutters mounted at opposite ends of a common shaft; a second cutter head for carrying the set of horizontal cutters, said second cutter head being slidably mounted on the other side of the overarm; said cutter heads being independently movable across the path of the work and past one another so that the vertical cutter may be used simultaneously with one of the horizontal cutters to machine a concave surface and a side of the Work, and may also be used simultaneously with the other horizontal cutter to machine a convex surface and a side of the work.

EDGAR BARKER.

REFERENCES CITED The following references are of record in the file of this patent: 

